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A New Species of Nucleo-Cytoplasmic Large DNA Virus (NCLDV) Associated with Mortalities in Manitoba Lake Sturgeon Acipenser Fulvescens

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A New Species of Nucleo-Cytoplasmic Large DNA Virus (NCLDV) Associated with Mortalities in Manitoba Lake Sturgeon Acipenser Fulvescens Vol. 102: 195–209, 2013 DISEASES OF AQUATIC ORGANISMS Published February 28 doi: 10.3354/dao02548 Dis Aquat Org A new species of nucleo-cytoplasmic large DNA virus (NCLDV) associated with mortalities in Manitoba lake sturgeon Acipenser fulvescens Sharon C. Clouthier1,*, Elissa VanWalleghem1,2, Shelagh Copeland3, Cheryl Klassen2, Gary Hobbs4, Ole Nielsen1, Eric D. Anderson5 1Freshwater Institute, Fisheries & Oceans Canada, 501 University Crescent, Winnipeg, Manitoba R3T 2N6, Canada 2Department of Biological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada 3Manitoba Agriculture, Food and Rural Initiatives, Veterinary Diagnostic Services, 545 University Crescent, Winnipeg, Manitoba R3T 5S6, Canada 4Manitoba Conservation and Water Stewardship, Ecological Services Division, Grand Rapids, Manitoba R0C 1E0, Canada 5Box 28, Group 30, RR2, Ste. Anne, Manitoba R5H 1R2, Canada ABSTRACT: A newly discovered virus, Namao virus, associated with morbidity and mortality, was detected among juvenile lake sturgeon Acipenser fulvescens being propagated by a conservation stocking program for this endangered species in Manitoba, Canada. The outbreaks resulted in cumulative mortalities of 62 to 99.6% among progeny of wild Winnipeg River or Nelson River lake sturgeon and occurred at 2 geographically separate facilities. Namao virus was detected in almost 94% of the moribund or dead lake sturgeon according to a conventional polymerase chain reac- tion (cPCR) test that is based upon amplification of a 219 bp fragment of the virus major capsid protein (MCP). The virus itself was large (242 to 282 nm) and icosahedral-shaped with 2 capsids and a condensed bar-shaped core. It was found in virus factories within the host cell cytoplasm and displayed a tropism for the integument. Namao virus caused cellular changes characterized by enlarged eosinophilic epithelial cells in the gills and skin. Samples suspected of containing Namao virus did not have cytopathic effects on primary lake sturgeon or established white stur- geon cell lines. However, viral nucleic acid was detected in the former after prolonged incubation periods. Using primers designed from conserved regions of the MCP from NCLDVs, an estimated 95 to 96% of the Namao virus MCP open reading frame was captured. Phylogenetic analysis using the MCP of Namao virus and 27 other NCLDVs suggested that Namao virus and white sturgeon iridovirus share a common evolutionary past and might be members of the family Mimiviridae or a new, as yet unrecognized, virus family. KEY WORDS: Namao virus · Mimiviridae · Endangered species Resale or republication not permitted without written consent of the publisher INTRODUCTION and Ascoviridae, they form a putative monophyletic class of viruses referred to as nucleo-cytoplasmic Viruses classified within the families Mimiviridae, large DNA viruses (NCLDVs; Table 1) (Iyer et al. Phyco dnaviridae and Iridoviridae as well as the Mar- 2001, 2006, Koonin & Yutin 2010). A common ances- seillevirus and megaviruses are a ubiquitous compo- tral virus is suggested to have possessed a set of at nent of the aquatic environment (Chen et al. 1996, least 47 conserved genes that can be mapped onto Fuhr man 1999, Monier et al. 2008, Van Etten et al. the genomes of extant NCLDVs (Koonin & Yutin 2010). Along with members of the families Poxviridae 2010). As a group, they share 5 common protein- *Email: [email protected] © Inter-Research and Fisheries and Oceans Canada 2013 · www.int-res.com 196 Dis Aquat Org 102: 195–209, 2013 Table 1. Members of the nucleo-cytoplasmic large DNA virus (NCLDV) super-family Virus taxon Host range Genome Capsid size (kb) diameter (nm) Iridoviridae Insects, cold blooded vertebrates 100−220 120−350 Ascoviridae Insects, mainly Noctuids 150−190 130 Asfarviridae Mammals 170 170−190 Poxviridae Insects, reptiles, birds, mammals 130−380 200 Phycodnaviridae Green algae; algal symbionts of paramecia & hydras 150−400 130−200 Marseillevirus Amoeba 370 250 Mimiviridae CroV Marine microzooplankton 730 300 Mimivirus Amoeba 1181 390−400 Mamavirus Amoeba 1191 Not available Megaviruses Unknown 1259 440 Sturgeon viruses Namao virus (NV) Lake sturgeon Unknown 225−263 White sturgeon iridovirus (WSIV) White sturgeon Unknown 262 Missouri River sturgeon iridovirus (MRSIV) Pallid and shovelnose sturgeon Unknown 254 Russian sturgeon iridovirus (RSIV) Russian sturgeon Unknown 283 coding sequences (CDSs), including the major capsid geon Scaphirhynchus albus and shovelnose sturgeon protein (MCP), with an additional 177 shared by 2 or S. platorynchus (Kurobe et al. 2010, 2011). more families within the NCDLV super-family (Yutin Sturgeon NCLDVs can assume a complex lifecycle. et al. 2009). In some instances they cause upwards of 95% mor- NCLDVs replicate in the cytoplasm of the host cell tality within captive populations whereas in others or start their life cycle in the host nucleus and com- they are associated with a chronic debilitating wast- plete it in the cytoplasm (Iyer et al. 2001, 2006, Koonin ing syndrome, resulting in severely impaired growth & Yutin 2010). They share common biophysical char- and reduced survival of fry and fingerlings (Hedrick acteristics such as complex, isometric virion structures et al. 1990, LaPatra et al. 1994, Kurobe et al. 2011). (120 to 440 nm) and very large double-stranded DNA Outbreaks of viral disease in white sturgeon as well genomes (0.1 to 1.3 Mb) (Table 1). The number of as pallid or shovelnose sturgeon are typically ob - CDSs of many NCLDVs exceeds that of the small - served during the first year of growth in hatcheries est free-living bacteria Mycoplasma genitalium (Hedrick et al. 1990, 1992, Kurobe et al. 2011). Adults (~470 CDS, Claverie et al. 2006). The large repertoire can be refractory to clinical disease, but are likely of genes encoding proteins involved in DNA replica- subclinical carriers that may intermittently shed virus tion, processing, maturation and packaging, tran- (Hedrick et al. 1990, LaPatra et al. 1994, Kurobe et al. scription initiation and elongation as well as capsid 2011). Horizontal transmission of WSIV and MRSIV proteins and chaperones for assembly provide from convalescent to naïve juvenile sturgeon has NCLDVs with relative autonomy from the host cell. It been demonstrated (Hedrick et al. 1990, Drennan et is perhaps not surprising that they can have diverse, al. 2006, Kurobe et al. 2011) and there are sugges- complex life-cycles and a broad host range that in- tions that egg-associated transmission from adult to cludes amoeba, algae, insects, reptiles, birds, mam- offspring occurs during spawning (Hedrick et al. mals, and fish (Van Etten et al. 2010, Van Etten 2011). 1992, LaPatra et al. 1994, Georgiadis et al. 2001). Several NCLDVs of sturgeon (Acipenseridae) hith- Handling, stocking density and fluctuations in water erto recognized as unclassified members of the family levels, flow rates, and/or temperature are among the Iridoviridae, pose a potential disease risk for strategies other risk factors known to contribute to the onset designed to aid the recovery of threatened sturgeon and severity of these disease outbreaks (LaPatra et populations in North America. These include the al. 1994, 1996, Watson et al. 1998a, Georgiadis et al. white sturgeon iridovirus (WSIV), found in wild and 2000, 2001, Drennan et al. 2005, 2006). cultured white sturgeon Acipenser transmontanus WSIV and MRSIV have historically been diag- (Hedrick et al. 1990, LaPatra et al. 1994, Raverty et al. nosed using a combination of histology and electron 2003), as well as the Missouri River sturgeon iridovirus microscopy. Both viruses localize to the integument (MRSIV), which has been isolated from pallid stur- of the oropharynx and olfactory organs as well as the Clouthier et al.: Lake sturgeon Namao virus 197 fins and in some cases the epithelium of the gills tional (cPCR) and/or quantitative PCR (qPCR) assays (Hedrick et al. 1990, Watson et al. 1998b, Drennan et have been developed to detect WSIV or MRSIV. The al. 2007, Kurobe et al. 2011). Microscopic signs of current white sturgeon end-point or qPCR assays tar- infection include hypertrophied, basophilic or ampho- get viral DNA encoding the MCP (Kwak 2006, Kwak philic- to eosinophilic-staining cells and eccentric et al. 2006) which is one of the 5 orthologous DNA nuclei, as well as inclusion bodies containing isomet- sequences common to NCLDVs (Yutin et al. 2009), ric, doubly encapsidated virus particles displaying a while the MRSIV qPCR assay is based on amplifica- condensed bar-shaped nucleoid (Hedrick et al. 1990, tion of DNA encoding the serpin protein (Kurobe et 1992, Kurobe et al. 2011). A number of white stur- al. 2010). Neither of these assays is capable of detect- geon cell lines have been developed that are permis- ing viral DNA from the aforementioned NCLDV sive to WSIV amplification but in an isolate-specific found in Manitoba lake sturgeon. manner and sometimes without evidence of cyto- In this paper we provide the first description of a pathic effect (CPE) (Hedrick et al. 1991, Watson et al. new NCLDV found in populations of Manitoba (MB) 1998b). These as well as pallid and shovelnose- lake sturgeon Acipenser fulvescens, a species classi- derived cell lines do not support the growth of fied as endangered by the Committee on the Status MRSIV (Kurobe et al. 2011). More recently, conven- of Endangered Wildlife in Canada (COSEWIC 2011). Further, we provide evidence of a new NCLDV lineage comprised of these sturgeon viruses and discuss their
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